Question 1131883
probability is (1/365)
so mean is np=222/365 or 0.608219
variance is np(1-p)=0.608*(364/365)=0.606
sd is sqrt(V)=0.78
probability two are born on that day is within 2 sd s of the mean
it is 365C2*(1/365)^2*(364/365)^220
=0.2727,  Not at all unlikely.  
Can use 6 decimal places for the others; question wasn't clear to which it  applied.